Well-drilling bit.



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M. A. BYRON & H. W. ENGLISH.

WELL DRILLING BIT.

APPLICATION FILED MAR. 19, 1912.

Patented Feb. 11, 1913.

I n we nf o r5 Harry E/fgZZZY/Z MarczwA 1m Uorny.

@TATES MARCUS A. BYRON AND HARRY WHITE ENGLISH, 0F FORT WORTH, TEXAS.

WELL-DRILLING- BIT.

Application filed March 19, 1912.

To all whom it may concern:

Be it known that we, Marion's A. BYRON and HARRY l Vrnrn ENoLrsrr,citizens of the United States, residing at Fort forth, in the county ofTarrant and State of Texas, have invented certain new and useful1mprovements in lVell-Drilling Bits; and we do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it a-ppertains tomake and use the same, reference being had to the accompanying drawings,and to the letters and figures of reference mar ed thereon, which form apartof this specification.

This invention relates to new and useful improvements in well drillingbits through which the bit is adapted to open and close and allowingeasy passage of the bit through the opening after passing through theplate to working position, thereby drilling a hole large enough toinsert same sized casing as that through which the bit has passed.

Heretofore, it has been the practice, when it has been desired to lowerthe casing down within the hole that has been drilled, to drill the holethe size of the inside casing, by use of an under reamer to ream out thehole to the size of the outside casing but with our improved apparatus,forming the subject matter of our present application, the marginal holeis drilled the size of the inside casing, after which the casing may belowered without the use of an under reamer.

Our invention is illustrated in the accompanying drawings, in whichFigure l is a side elevation of our improved bit. Fig. 2 is an edgeview. Fig. 3 is a view in elevation of the upper part of the bit. Fig.iis a perspective view of one section of the bit. Fig. 5 is a viewpartially in section and in elevation showing the interior mechanism,and Fig. 6 is a detail view in section, illustrating in elevation one ofthe springpressed gibs.

Reference now being had to the details of the drawings by letter, adesignates the top section of the device which is threaded as at h forengagement with a box, not shown, in the usual manner.

The legs of the drill, designated by letters 2) and c are pivotallyconnected to the top through the medium of the pin (Z passing through anaperture 70 in a contracted projection of said top, also throughaperture 1), one of which is shown in Fig. 5 of the draw- Specificationof Letters Patent.

Patented Feb. 11, 1913.

Serial No. 684,858.

in rs, while the bottoms of the legs are free to swing, said pin beingheld in place by a pin to, which latter is passed through an aperture 0formed in one edge of the plate a. Each leg is provided with adiagonallydisposed opening in which gibs f and g are mounted, each having a headadapted to contact with the wall of said opening to limit its outerthrow, and each held to its outer limit yieldingly through the medium ofa coiled spring 1 which is seated in a chambered portion of the leg, asshown clearly in Fig. 6 of the drawings. A plate 0 closes the openingthrough which a gib is passed and is held by means of bolts n. The freeend of each gib projects through the opening, as shown clearly in thedrawings, and is adapted to contact with the end wall of the casing atpoints diametrically opposite as the bit is lowered through the casing.Projecting from the end wall of the leg 0 are the studs 2' and 7' andsimilar studs 1" and 3 project from the inner surface of the leg Z), andcoiled springs u and t engage over said lugs and tend to throw the twolegs apart after the bit has passed through the lower end of the casing.Project-ions 79 and 00, the former upon the leg 0 and the latter uponthe leg Z), serve as means for closing the space intermediate the legs.

In operation, the parts being adjusted as shown in Fig. 1 and, when thebit is passed through the casing, the gibs coming in contact with thesides of the casing will hold the legs together, as shown in Fig. l and,after the bit has passed through the casing, the legs will be thrown inopposite directions by means of the coiled springs t and u, thus makingit possible to drill under the casing a hole as large as the outsidediameter of the couplings of the casing through which the bit is passed.When the bit is drawn out, the gibs f and 9 coming in contact with thecasing will be forced within the openings in the legs.

What- We claim to be new is 1. An under drilling bit comprising twolegs, coiled springs mounted between the same and normally holding thesame spaced apart, a top to which said legs are pivoted, andspring-pressed gibs mounted within openings, one in each of said legswith their outer ends projecting beyond the circumferences of the legs,as set forth.

2. An under drilling bit comprising two legs, which are pivotedtogether, a top to the leg, a gib passing through said passage-.

way with its free end extending beyond the end of said opening andadapted to contact with the inner surface of the casing, springs forholding said .gibs at their farthest outerthrow, and springs bearingbetween the legs to separate the same when free from the casing, as setforth.

3. An under drilling bit comprising two legs, which are pivotedtogether, a top to which the legs are pivoted, each leg having achambered portion with a diagonally disposed opening leading therefromthrough the leg, a gib passing through said passageway with its free endextending beyond the end of said opening and adapted to contact with theinner surface of the casing, the inner end of eachgib having a headadapted to contact with a shoulder in the chambered portion of the leg,a coiled spring bearing intermediate the wall of the chamber and saidhead, tending to normally hold the gib with its free end projectingthrough the opening in the leg, and a spring for normally holding thelegs separate, as set forth.

4. An under drilling bit comprising two legs, which are pivotedtogether, a top to which the legs are pivoted, each leg having achambered portion with a diagonally disposed opening leading therefromthrough the leg, a gib passing through said passageway with its free endextending beyond the end of said opening and adapted to contact with theinners'urface of the casing, the inner end of each gib having a headadapted to contact with a shoulder in the chambered portion of the leg,a coiled spring bearing intermediate the wall of the chamber and saidhead, tending to normally hold the gib with its free end projectingthrough the opening in the leg, lugs projecting from the end surface ofeach leg, and coiled springs fitted over said lugs and adapted to holdthe legs separated, as set forth.

5. An under drilling bit comprising two legs, which are pivotedtogether, a top to which the legs are pivoted, each leg having achambered portion with a diagonally disposed opening leading therefromthrough the leg, a gib passing through said passageway with its free endextending beyond the end of said opening and adapted to contact with theinner surface of the casing, the inner end of each gib having a headadapted to contact with a shoulder in the chambered portion of the leg,a coiled spring bearing intermediate the wall of the chamber and saidhead, tending to normally hold the gib with its free end projectingthrough the opening in the leg a spring for normally holding the legsseparate, and projections one upon each leg and adapted to close thespace between the legs, as set forth.

In testimony whereof we hereunto afiix our signatures in the presence oftwo witnesses.

MARCUS A. BYRON. HARRY WHITE ENGLISH.

WVitnesses for M. A. Byron:

P. E. ASHWORTH, LULU E. MCLAUGHLIN.

Witnesses for Harry White English:

C. H. WALTON, J. A. PHINNEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

